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JAMB Biology 2024 Paper

Question : 17

Total: 117

The total number of ATP produced during glycolysis is

3 molecules
2 molecules
4 molecules
6 molecules

Solution:

Concept:

The total number of ATP produced in glycolysis means all the ATP actually synthesized during the process, not the net gain after subtracting the ATP used.

Explanation:

Glycolysis splits one glucose molecule into two pyruvate molecules in the cytoplasm.

In the energy-investment phase,

2\ \text{ATP}

are used to phosphorylate glucose.

In the energy-payoff phase,

4\ \text{ATP}

are synthesized from

\text{ADP}

and

\text{P}_i

So, the total ATP produced during glycolysis is

4\ \text{ATP}

molecules.

The net gain is

4 - 2 = 2\ \text{ATP}

, but the question asks for the total produced, not the net gain.

Answer:

4

molecules

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